31001212139 has 2 divisors, whose sum is σ = 31001212140. Its totient is φ = 31001212138.

The previous prime is 31001212127. The next prime is 31001212141. The reversal of 31001212139 is 93121210013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31001212139 - 2²⁰ = 31000163563 is a prime.

It is a super-2 number, since 2×31001212139² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 31001212141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31001212159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500606069 + 15500606070.

It is an arithmetic number, because the mean of its divisors is an integer number (15500606070).

Almost surely, 2^31001212139 is an apocalyptic number.

31001212139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31001212139 is an equidigital number, since it uses as much as digits as its factorization.

31001212139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 31001212139 in words is "thirty-one billion, one million, two hundred twelve thousand, one hundred thirty-nine".